:root {
  color-scheme: light;
  --bg: #fafbfc;
  --bg-alt: #f0f2f5;
  --text: #1a1f36;
  --text-secondary: #4b5563;
  --accent: #1c2541;
  --accent-light: #2e4068;
  --accent-bg: rgba(28, 37, 65, 0.06);
  --card-bg: #ffffff;
  --card-border: #e2e5ea;
  --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  --success: #15803d;
  --font: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --heading-font: 'Newsreader', 'Noto Serif SC', Georgia, serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0c1019;
  --bg-alt: #121825;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --accent: #7b9acc;
  --accent-light: #a3bee0;
  --accent-bg: rgba(123, 154, 204, 0.1);
  --card-bg: #1a2030;
  --card-border: #2a3348;
  --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.22);
  --success: #86efac;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.7;
}

a {
  color: inherit;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.app-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 24px;
  background: var(--accent);
  color: #f8fafc;
  overflow-y: auto;
}

.brand-block {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 16px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: #ffffff;
  color: #1c2541;
  font-weight: 800;
  text-decoration: none;
}

.brand-block h1 {
  font-size: 20px;
  line-height: 1.15;
}

.brand-block p {
  margin-top: 4px;
  color: rgba(248, 250, 252, 0.74);
  font-size: 13px;
}

.home-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  color: rgba(248, 250, 252, 0.82);
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
}

.home-link:hover {
  color: #fff;
}

.control-group {
  margin-bottom: 22px;
}

.control-group label {
  display: block;
  margin-bottom: 8px;
  color: rgba(248, 250, 252, 0.78);
  font-size: 13px;
  font-weight: 650;
}

input,
select {
  width: 100%;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  color: #f8fafc;
  padding: 0 12px;
  font-family: var(--font);
  font-size: 14px;
}

select option {
  color: #1a1f36;
}

input::placeholder {
  color: rgba(248, 250, 252, 0.54);
}

.tag-list {
  display: grid;
  gap: 8px;
}

.facet-group {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.045);
  overflow: hidden;
}

.facet-group[open] {
  background: rgba(255, 255, 255, 0.07);
}

.facet-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  list-style: none;
  cursor: pointer;
  padding: 10px 11px;
  color: rgba(248, 250, 252, 0.84);
  font-size: 12px;
  font-weight: 750;
}

.facet-heading::-webkit-details-marker {
  display: none;
}

.facet-heading::after {
  content: "展开";
  color: rgba(248, 250, 252, 0.58);
  font-size: 11px;
  line-height: 1;
}

.facet-group[open] .facet-heading::after {
  content: "收起";
}

.facet-count {
  margin-left: auto;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  padding: 1px 7px;
  color: rgba(248, 250, 252, 0.62);
  font-size: 11px;
}

.facet-buttons {
  display: grid;
  gap: 5px;
  padding: 0 9px 9px;
}

.tag-button,
.filter-chip {
  border: 1px solid var(--card-border);
  border-radius: 999px;
  background: var(--card-bg);
  color: var(--text);
  padding: 6px 10px;
  font-family: var(--font);
  font-size: 12px;
}

.tag-button {
  width: 100%;
  border-color: rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.08);
  color: rgba(248, 250, 252, 0.82);
  cursor: pointer;
  text-align: left;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  line-height: 1.35;
}

.tag-button.active {
  background: #fff;
  border-color: #fff;
  color: #1c2541;
}

.content {
  min-width: 0;
  padding: 32px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 18px;
}

.eyebrow {
  margin-bottom: 4px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.topbar h2 {
  font-family: var(--heading-font);
  font-size: 32px;
  line-height: 1.15;
}

.page-subtitle {
  max-width: 680px;
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.topbar-actions {
  display: grid;
  gap: 12px;
  justify-items: end;
}

.back-home-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  background: var(--card-bg);
  color: var(--text);
  padding: 8px 13px;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--card-shadow);
}

.back-home-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(74px, 1fr));
  gap: 10px;
}

.stats div {
  padding: 12px 14px;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
}

.stats strong {
  display: block;
  font-size: 20px;
}

.stats span {
  color: var(--text-secondary);
  font-size: 12px;
}

.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 32px;
  margin-bottom: 16px;
}

.article-list {
  display: grid;
  gap: 14px;
}

.article-card {
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--card-bg);
  padding: 18px;
  box-shadow: var(--card-shadow);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
  color: var(--text-secondary);
  font-size: 12px;
}

.pill {
  border-radius: 999px;
  padding: 4px 8px;
  background: var(--accent-bg);
  color: var(--accent);
  font-weight: 650;
}

.score {
  color: var(--success);
  font-weight: 800;
}

.article-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
  line-height: 1.35;
}

.article-card h3 a {
  color: var(--text);
  text-decoration: none;
}

.article-card h3 a:hover {
  color: var(--accent);
}

.article-body {
  display: grid;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
}

.article-body strong {
  color: var(--text);
}

.entity-row {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}

.entity-chip {
  border-radius: 999px;
  background: var(--accent-bg);
  color: var(--accent);
  padding: 4px 8px;
  font-size: 12px;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 220px;
  border: 1px dashed var(--card-border);
  border-radius: 8px;
  color: var(--text-secondary);
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .topbar {
    flex-direction: column;
  }

  .topbar-actions {
    width: 100%;
    justify-items: start;
  }

  .stats {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .content,
  .sidebar {
    padding: 18px;
  }

  .topbar h2 {
    font-size: 25px;
  }

  .stats {
    grid-template-columns: 1fr;
  }
}